are expected to significantly supplement the expensive and depleting fossil fuels. With the increasing world’s energy requirement and growing environmental concerns, renewable energy resources like wind, solar, biomass, etc. The numerical results also indicated that UBD5494 airfoil has enhanced lift-to-drag ratio and desirable stall characteristics which are distinctively advantageous for the better performance of small wind turbine rotors. With decreasing Re, the size of the laminar separation bubble is found to be increasing and its progress towards the leading edge is noticed to be slower. It starts to expand after reaching the foremost point of the leading edge and then bursts, resulting in flow turbulence and stall. Simulation results show that with the increase in angle of attack, laminar separation bubble moves towards the leading edge and at the same time contracts in size. The aerodynamic performance of the airfoil is also examined against the flow behaviour. Modified constants of the Reynolds momentum thickness are incorporated in the model. The mechanism of the laminar separation bubble and the laminar-turbulent transition over the airfoil UBD5494 is simulated in ANSYS-FLUENT using the transition \(\) model at Reynolds number 6 × 10 4, 1 × 10 5, 1.5 × 10 5, 2 × 10 5 and 3 × 10 5.
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